/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package br.unesp.demac.bcc.soo.clarus.servlets;

import br.unesp.demac.bcc.soo.clarus.bean.Aluno;
import br.unesp.demac.bcc.soo.clarus.bean.Obra;
import br.unesp.demac.bcc.soo.clarus.dao.ObraDAO;
import br.unesp.demac.bcc.soo.clarus.dao.ObraDAOImp;
import br.unesp.demac.bcc.soo.clarus.google.Client;
import br.unesp.demac.bcc.soo.clarus.google.Result;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 * @author esaheki
 */
@WebServlet(name = "ObraServlet", urlPatterns = {"/ObraServlet"})
public class ObraServlet extends HttpServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        
        String param = request.getParameter("idObra");
        int idObra = Integer.parseInt(param);
        
        HttpSession session = request.getSession(true);
        String page = "";
        
        Aluno aluno = (Aluno) session.getAttribute("aluno");
        if (aluno == null) {
            page = "erro.jsp";
            session.setAttribute("mensagem", "Sessão Invalida<br>Favor autenticar-se no sistema!");
        } else {
            ObraDAO odao = new ObraDAOImp();
            Obra obra = odao.getObraById(idObra);

            if (obra != null) {
                
                // Google Search Ajax API Client
                Client client = new Client();
                List<Result> covers = client.searchImages(obra.getNomeObra() + " " + obra.autoresToString());
                obra.setCoverUrl(covers.get(0).getUrl());
                                        
                page = "obra.jsp";
                session.setAttribute("obra", obra);
            } else {
                page = "erro.jsp";
                session.setAttribute("mensagem", "Dados inválidos");
            }
        }

        request.getRequestDispatcher(page).forward(request, response);

    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
